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Related Concept Videos

Pharmacodynamics: Overview and Principles01:21

Pharmacodynamics: Overview and Principles

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Pharmacodynamics is a scientific field that delves into drugs' intricate biochemical, cellular, and physiological effects on the human body. The study of pharmacodynamics helps us understand how drugs interact with the body and elicit various responses.
Most drugs' effects result from their interactions with drug receptors or targets within the body. These interactions trigger specific responses at the cellular or systemic level. Drug receptors can be found on the surfaces of cells or...
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Drug Concentration Versus Time Correlation01:15

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The plasma drug concentration-time curve is a crucial tool in pharmacokinetics, representing the drug's concentration in plasma at different time intervals post-administration. This curve illustrates the drug's journey from absorption into the systemic circulation, distribution to body tissues, and eventual elimination through excretion or biotransformation.
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Principles of Drug Action01:24

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Drugs are chemical substances that modify biological responses by interacting with macromolecular targets such as receptors, ion channels, transporters, and enzymes. Pharmacodynamics describes the course of action of drugs leading to the physiological effect at a specific site in the body.
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Pharmacodynamic methods provide insights into a drug's effects on physiological processes over time and play a crucial role in understanding bioavailability and therapeutic efficacy. These methods can be broadly classified into acute pharmacological and therapeutic response approaches, each with distinct mechanisms and applications.The acute pharmacological response method directly correlates a drug's physiological effects, such as ECG or pupil diameter changes, to its time course in the body.
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Therapeutic Drug Monitoring: Affecting Factors01:29

Therapeutic Drug Monitoring: Affecting Factors

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Therapeutic Drug Monitoring (TDM) is the clinical practice of measuring specific drug levels in a patient's blood or body tissues to manage and optimize therapy. TDM is crucial for drugs with narrow therapeutic windows, like warfarin and phenytoin, where incorrect doses can lead to treatment failure or severe side effects. This monitoring ensures the dosage administered is within a safe and effective range. The factors affecting therapeutic drug monitoring include:Patient-Specific Factors:a.
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Dosage Regimens: Partial Pharmacokinetic Parameters01:01

Dosage Regimens: Partial Pharmacokinetic Parameters

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It is not uncommon for complete drug pharmacokinetic profiles to remain elusive in pharmacokinetics. This necessitates certain educated assumptions by pharmacokineticists to determine appropriate dosage regimens without comprehensive pharmacokinetic data from animal or human studies. One prevalent assumption is setting the bioavailability factor, denoted as F, to 1 or 100%. This assumption caters to the scenario where a drug doesn't achieve full systemic absorption, resulting in the patient...
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Related Experiment Video

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Network Pharmacology Prediction and Metabolomics Validation of the Mechanism of Fructus Phyllanthi against Hyperlipidemia
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Pharmacodynamic principles and target concentration intervention.

Nick Holford1

  • 1Department of Pharmacology & Clinical Pharmacology, University of Auckland, Auckland, New Zealand.

Translational and Clinical Pharmacology
|February 15, 2020
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Summary

This tutorial explains dose individualization, focusing on target concentration intervention (TCI). It details how pharmacodynamics and pharmacokinetics guide dose adjustments for optimal patient response, moving beyond fixed dosing.

Keywords:
Target concentrationTarget concentration interventionTarget doseTarget effectTherapeutic drug monitoring

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Area of Science:

  • Pharmacology
  • Clinical Pharmacy
  • Pharmacometrics

Background:

  • Traditional fixed dosing (
  • one size fits all
  • ) is often inadequate for effective drug therapy.
  • Dose individualization is crucial for optimizing therapeutic outcomes and minimizing adverse effects.

Purpose of the Study:

  • To review the principles of dose individualization.
  • To emphasize the role of target concentration intervention (TCI) in optimizing drug dosing.
  • To differentiate between population, group, and individual dosing strategies.

Main Methods:

  • Review of pharmacokinetic and pharmacodynamic principles.
  • Explanation of target concentration intervention (TCI) for dose prediction.
  • Discussion of dose adjustment strategies based on patient-specific factors.

Main Results:

  • Pharmacodynamics predicts target concentration based on desired effect.
  • Pharmacokinetics predicts the necessary dose to achieve the target concentration.
  • Dose individualization can be applied at population, group, or individual levels.

Conclusions:

  • Target concentration intervention (TCI) allows for precise dose individualization.
  • Individualized dosing, informed by patient response, offers superior clinical pharmacology compared to fixed dosing.
  • Optimizing drug therapy requires considering individual patient pharmacokinetic and pharmacodynamic variability.